2.不定式作某些动词的宾语补足语或主语补足语时,这些动词常见的有:ask,tell,advise,force,persuade,wish,allow,permit,forbid,expect,order,warn 等。如 :
(1)(NMET1995) The boy wanted to ride his bicycle in the street,but his mother told him not to .
(2) She wants to come but her parents wont allow her to
3.不定式在句中作某些形容词的状语时,常见的形容词有 :happy,glad,eager,anxious,willing,ready 等。如: (NMET1995) I will be away on a business trip .Could you mind looking after my cat ? Not at all .I would be happy to
4.不定式作某些复合谓语时,常见结构如:be able to,be going to,have to,ought to,used to等。如: He doesnt like fish but he used to 他现在不喜欢吃鱼,但过去喜欢。
五、动词不定式to 的省略
1.主语部分有to do,系动词 is 或 was 时,作表语的不定式通常省去to.如: The only thing you have to do is press the button.你必须做的唯一事情是按按钮。
2.作介词but,expect,besides 的宾语,前面又有实意动词 do时,不定式通常省去to. 如:He said that Chen Shuibian had nothing to do except push a pro-independence timetable.他说陈水扁除了推进支持独立的时间表外,什么也没有做。
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